[OICS-651]:Changed expected error to 403 and removed status validation

Closes OICS-651

Fixes #241 (closed)

Unable to test changes with mockin. Currently getting 401 with presumably correct config. Edit: New config still gives 401 despite looking correctly in urls and other interchangable parts. test-log-opin-endorsement-api-wrong-permissions-test-mtls-by_value-openbanking_brazil-plain_response-smT3aBJx6LCgdY2.zip